| |
| # | Species | Formula |
| 6249 | Te(IV)I6(2-) (IZOWAV) (Geo) | Te2I10 | |
| 6250 | Te(IV)I6(2-) (IZOWAV) | Te2I10 | |
| 6251 | Xenon, cation | Xe | |
| 6252 | Xenon, atom | Xe | |
| 6253 | Xenon Lithium, cation (Geo) | LiXe | |
| 6254 | Xenon tetroxide | O4Xe | |
| 6255 | Xenon tetroxide (Geo) | O4Xe | |
| 6256 | Xenon fluoride, anion (Geo) | FXe | |
| 6257 | Xenon tetrafluoride (Geo) | F4Xe | |
| 6258 | Xenon tetrafluoride | F4Xe | |
| 6259 | Xenon sodium, cation (Geo) | NaXe | |
| 6260 | Xenon chloride, anion (Geo) | ClXe | |
| 6261 | Xenon potassium, cation (Geo) | KXe | |
| 6262 | Xenon bromide, anion (Geo) | BrXe | |
| 6263 | Xenon iodide, anion (Geo) | IXe | |
| 6264 | Cesium, cation | Cs | |
| 6265 | Cesium, 2P(u) - 6s(0)6p(1) | Cs | |
| 6266 | Cesium, 2S(g) - 6s(1)6p(0) | Cs | |
| 6267 | Cesium, atom | Cs | |
| 6268 | Cesium, anion | Cs | |
| 6269 | Methyl cesium (Geo) | CH3Cs | |
|